The big stack of things that Sun Xiaoping brought over was not a letter of appointment, but a confidentiality agreement to be signed by everyone, and those who participated in the meeting must strictly keep it confidential in accordance with the requirements of the confidentiality agreement, and it is strictly forbidden to leak secrets.

Li Tianfeng said solemnly: "All stand up!" ”

In the whole conference room, the atmosphere suddenly became serious, everyone stood up one after another, Li Tianfeng said with a straight face: "The development of turbofan 20, the official national code name 106 project, everyone here is the backbone of the development of turbofan 20 engine, and now I announce the formal discipline ......"

Li Tianfeng personally announced a series of disciplines, especially in the areas of confidentiality and professional ethics.

Seeing this, the people in the entire conference room all became serious, and even when they heard the code name of Project 106, they were originally excited, and they immediately forcibly suppressed it.

After announcing a series of disciplines, Li Tianfeng said: "Now, everyone starts to sign a confidentiality agreement, and must strictly abide by it in accordance with the requirements of the confidentiality agreement." ”

Sun Xiaoping began to distribute the confidentiality agreement that needed to be signed to everyone, and when he got this agreement, everyone looked at it seriously, then signed his name, and handed it over to Sun Xiaoping one after another.

After signing the confidentiality agreement, Li Tianfeng said: "Of course, I will also give you a confidentiality fee every month, and when you get this money, you must strictly abide by the requirements of the confidentiality agreement, otherwise, not only will the confidentiality fee be canceled, but also you will be punished by law." ”

Li Tianfeng's words made everyone's expression serious, Li Tianfeng saw this, changed his words, and said in a slightly relaxed tone: "Okay, we will sign the agreement." Now let's discuss this technical outline of the design of the turbofan 20 that I have prepared myself. ”

After speaking, Li Tianfeng personally opened this design technical outline on the laptop and passed the projector. It is projected in front of everyone in the form of a slideshow.

Li Tianfeng said while showing everyone this design technical outline: "The turbofan 20 engine is planned to be the localized power of the Jian-10 in the future, with an engine thrust-to-weight ratio of 11, a maximum thrust (afterburner) of 150KN (about 33,000 pounds), and an engine weight of no more than 1,350 kg......"

"The engine channel ratio is 0.30 and the total pressure ratio is 35. On the basis of the turbofan 16 core machine, the fan is reduced, and the adjustable air intake guide vane is added in front of the fan. Three-stage fan, six-stage compressor, one-stage high-pressure turbine, two-stage low-pressure turbine......"

Li Tianfeng will design the technical outline. and the specific design parameters of the turbofan 20 engine are introduced one by one. Then, Li Tianfeng said: "This is my personal design technical outline, three stinkers have competed Zhuge Liang, if you have any opinions, you can speak freely, as long as you can adopt it, I will try my best to adopt it." ”

I have to say that this design technical outline is perfectly prepared. At least that's what most people think, because there's basically nothing wrong with it.

After a long time. A designer stood up and said: "Mr. Li, such an engine, if it is really developed, has far surpassed the current power of the J-10 Russian-made AL-31F engine, is it too advanced, such an engine, installed with the J-10 engine, is it a little overkill." ”

The more advanced the engine, the more difficult it is to develop, and it is certainly much easier to reduce the difficulty and sacrifice the performance of a part of the engine.

Obviously, this is what the designer meant, and suggested that Li Tianfeng reduce the difficulty of engine development and reduce part of the performance, there is no need to design it so advanced.

Li Tianfeng smiled and explained: "The turbofan 20 engine will not only be the power of the J-10 in the future, but may also be installed on the J-11 fighter, and also lay the foundation for our higher-level Xiaohandao military turbofan engine." ”

It turns out that this is the case, everyone has basically understood, since the adjustment has been decided, and this design technical outline is indeed impeccable, even if everyone brainstorms, they only mention some problems that are not faults.

Li Tianfeng said: "Since everyone basically has no doubts, then from today, we will carry out the comprehensive design work of this engine, the military requires us to fully complete the design work this year, next year to enter the trial production stage of parts and complete the final assembly of the first prototype, however, I think we can be a little ahead of time." ”

After speaking, Li Tianfeng said: "I will give you six months to fully complete the design of the turbofan 20 engine, do you have confidence!" ”

"Yes!"

Together, there was almost no hesitation, and they answered loudly in unison, looking full of confidence. Everyone is so confident, on the one hand, there is already a core machine, on the basis of the turbofan 16 engine core machine to carry out the design, on the other hand, Li Tianfeng personally served as the chief model designer.

For Li Tianfeng, everyone was full of unprecedented confidence, so everyone answered in unison, full of confidence.

Li Tianfeng nodded with satisfaction: "Of course, I will personally check some key technical issues, and I will personally design some key parts and some parts that are difficult to design." ”

As soon as Li Tianfeng said this, everyone's confidence was even stronger, and Sun Xiaoping was even more happy: "Boss, if you personally participate in the design, we will definitely be able to complete the comprehensive design work within six months." ”

After everyone reviewed the design outline together, Sun Xiaoping, as the director of the design institute and the deputy chief designer of the turbofan 20 engine, personally arranged a series of division of labor.

The meeting was very successful, and after the meeting, everyone immediately put into work according to the division of labor to carry out the comprehensive design of this engine.

………

Li Tianfeng promised that he personally participated in the design of this engine, and in terms of overall design, Li Tianfeng personally checked the design of some key components, and Li Tianfeng personally designed it.

In his office, Li Tianfeng is working on the design of the fan blades, because the turbofan 20 engine is a small-channel turbofan engine, and the fan size is greatly reduced, reducing the windward area to facilitate supersonic flight.

Civil airliners, to consider economy and fuel economy, are generally subsonic flight, such as the cruising speed is generally 0.8 Mach, and fighters are generally supersonic cruise, the cruising speed is generally more than Mach 1, or even at a speed of two to three Machs.

The design of the fan is very important, very critical, who said that the small channel does not need to save fuel than the engine, even if the turbofan 20 engine, under the premise of ensuring performance, it should be designed to be as fuel-efficient as possible, and the fuel utilization rate is high, under the same fuel situation, it means that the farther the fighter can fly, the greater the combat radius.

Whether the engine fuel utilization rate is high or not, the combustion chamber is one aspect, and the fan is also an aspect, that is, the design of the fan is very important and critical.

The working blades of the fan are still titanium alloy wide-chord fan blades, and the guide blades of the fan, Li Tianfeng uses composite guide vanes.

Composite materials, lighter weight and higher strength, Li Tianfeng's design habit is to draw a sketch first, and then use design drawing software on the computer to make a detailed design.

In Li Tianfeng's brain, there was obviously a design drawing of the fan guide vane, Li Tianfeng took an A3-sized piece of white paper, a pencil, and an eraser, and drew it quickly on his desk.

People who study mechanical design know that design sketches are generally drawn by hand, and can reflect a person's basic skills, obviously, Li Tianfeng's basic skills are very solid.

Even if the sketch is drawn freehand, it looks very beautiful, especially the imitation Song characters marked next to the sketch, and the size marked, which is very beautiful.

Especially the dimensions and technical conditions of those marked, those who don't know must think that they are marked with a ruler.

On the entire A3 size drawing, the design sketch of the adjustable guide vane at the front of the fan, that is, the first-stage guide vane, jumped on the paper, the thick lines were thick, the thin lines were thin, and Li Tianfeng nodded with satisfaction.

The turbofan 20 engine will not only surpass the Russian-made AL-31F engine in terms of overall performance, but also surpass the AL-31F engine in the use of new materials.

Not only the fan guide vane is a new type of composite material, the fan casing is the same, and the turbofan 16, turbofan 17 and turbofan 18 engines are the same, it is also a composite fan casing, such a casing, the weight is very light, it is very important to improve the thrust-to-weight ratio of the engine.

The first sketch is done!

Li Tianfeng is ready to draw out the sketch of the fan casing again, because the fan size of the turbofan 20 engine has been greatly reduced, and although the basic structure of the fan casing has not changed much, it still adopts the fan casing structure style of the turbofan 16 engine, but because of the reduced size, the corresponding modification is not small.

For the design of the fan casing, Li Tianfeng is ready to draw a sketch himself, especially to draw or point out the position to be changed, and hand over the specific design drawings to Sun Xiaoping to design.

Spreading out a piece of A3-sized white paper, picking up a pencil, and about to start sketching the fan casing, Li Tianfeng noticed that his phone was ringing.

Seeing that it was Zhang Haiping's call, Li Tianfeng immediately put down his pencil, picked up the phone, and pressed the call button, Li Tianfeng knew that Zhang Haiping must have something serious to call him, because Zhang Haiping was a member of the military expert group of the turbofan 20 engine.

Zhang Haiping said: "Mr. Li, has the design work of the turbofan 20 engine started, and are there any difficulties?" ”

Obviously feeling Zhang Haiping's concern, Li Tianfeng smiled and said: "Director Zhang, there is no difficulty for the time being, we have begun to enter the comprehensive design of the turbofan 20 engine. ”

"Ahh You're moving so fast! Zhang Haiping was slightly surprised at first, and then said: "Mr. Li, you don't know, just now, AVIC Group called over, complained, and said a lot of difficulties. ”

………

Today's three watches, the second one is sent! (To be continued......)